garymortimer writes: "Another great video from the guys at ETH Zurich. Four engined drones flying in time to music within a motion capture rig.

It might seem frivolous but the swarming algorithms and avoidance routines that the team are working on will form the core of next generation devices that have the processing grunt and 3D detection sensors to do most of the calculations on board.

The days of sending a small system off to take images of a leaking roof all on its own are not far off.